Tactile Feedback Control for Touch Displays
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Solution Overview
Problem
Portable electronic devices with touch-sensitive displays face challenges in providing effective tactile feedback due to limited space and the need for efficient use of resources, particularly in scenarios where multiple touches occur closely in time, leading to confusing or impractical tactile feedback.
Innovation Solution
The implementation of a method that provides tactile feedback based on touch attributes, such as force and time thresholds, using piezoelectric actuators and force sensors to simulate the depression and release of keys or switches, while optimizing feedback to reduce confusion and power consumption by delaying or omitting feedback for simultaneous touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tactile feedback is provided for every touch on a touch-sensitive display, then user feedback is enhanced, but power consumption increases and user confusion occurs when multiple touches happen closely in time
Solution Approach 1:
The system provides tactile feedback selectively rather than for every touch event. When multiple touches occur within a time threshold, feedback is provided only for the first touch, making the action partial to avoid excessive power consumption and user confusion while maintaining reliability for significant interactions
2Reliability
If tactile feedback is provided for every touch on a touch-sensitive display, then user feedback is enhanced, but user confusion occurs when multiple touches happen closely in time
Solution Approach 1:
The system applies partial action by providing tactile feedback only for the first touch when multiple touches occur within a time threshold. This selective approach prevents user confusion from redundant feedback while maintaining reliability for significant interactions, improving ease of operation
3Volume of moving object
If the device size is decreased for portability, then portability is improved, but space for tactile feedback mechanisms is reduced
Solution Approach 1:
The system replaces complex mechanical tactile feedback mechanisms with software-based control of piezoelectric actuators integrated into the touch-sensitive display structure. This substitution allows tactile feedback functionality to be maintained in smaller devices without proportionally increasing device complexity
Solution Approach 2:
The piezoelectric actuators serve multiple functions: they provide tactile feedback and are integrated into the touch-sensitive display structure itself. This multi-functionality allows the same component to serve both structural and feedback purposes, reducing the need for additional dedicated feedback mechanisms in compact devices
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances user experience by providing predictable tactile feedback while reducing power consumption and avoiding confusing responses, thus improving the usability and efficiency of portable electronic devices with touch-sensitive displays.
Implementation Method 1
A portable electronic device includes a touch-sensitive display, a piezoelectric actuator, and at least one processor
Data Source
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AI summary
A method includes detecting, at a first time, a first touch associated with a first touch value that meets one of a first touch threshold and a second touch threshold, detecting, at a second time, a second touch associated with a second touch value that meets one of the first touch threshold and the second touch threshold, providing first tactile feedback at the first time, and providing second tactile feedback at the second time when the time period between the first time and the second time meets a time threshold.